element.addEventListener('transitionend', function(event) { alert("CSS Property completed: " + event.propertyName); }, false ); For now, the exact event name has not been standardized. Here's a quote from MDN: There is a single event that is fired when transitions complete. In all standard-compliant browser, the event is transitionend,

Browser Support. Polyfill has been tested in the following browsers: NOTE: Internet Explorer 8 and its earlier versions are not supported. Usage Example. It's recommended to use this library in the form of a ponyfill, which doesn't inflict modifications of the global object.ponyfill, which doesn't inflict modifications of the global object.

node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/jit- polyfills.js","webpack:///./node_modules/classlist.js/classList.js","webpack:///. Oct 30, 2018 About transitionend as Mr @EisenbergEffect mentioned Can you check this link? transition-start. I am not good at this topic but It can be a polyfill  Oct 31, 2020 it's newer than ES6, so either use a polyfill or use iterators and Babel instead, propertyName === flex */ /* Chrome + FF transitionend event. Modernizr 是什么; 安装 Modernizr; Polyfill 与 Modernizr; Modernizr.load() 教程 ' MozTransition' : 'transitionend', // only for FF < 15 'transition' : 'transitionend'  Alternativelly, for Native Javascript for Bootstrap I made a lightweight polyfill with of any functions to detect transitionend , for performance and other reasons,  you just have to load polyfill.io and your vanilla JS code will work just fine. addEventListener('transitionend', (event) => { // When animation is finished });  It works on Chrome and Firefox, you can use polyfills to make it work on legacy addEventListener( 'transitionend', function(event) { el.style.display = 'none'; }  Polyfill.

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transition-start. I am not good at this topic but It can be a polyfill  If there is no native Symbol 1407 // nor polyfill, then a plain number is used for in window)) { 2763 delete vendorPrefixes.transitionend.transition; 2764 } 2765  resize-observer-polyfill documentation, tutorials, reviews, alternatives, you could add a short transition which would trigger the transitionend event when an   indexOf( array,